Accessing opengroupware with xmlrpc

Hi, I'm trying to connect to opengroupware through xmlrpc; I'm working 
with a RedHat 9.0. I followed the "Installing OpenGroupware on RH9 - 
Unofficial HowTo", whose link I found in the install page of 
opengroupware site.
Then I followed the instructions in the "The xmlrpc_call Tool" page: the 
test connection with 
http://www.oreillynet.com/meerkat/xml-rpc/server.php worked, but the 
connection with my opengroupware server:

xmlrpc_call http://localhost:20000/RPC2

gave me the following error:

Uncatched Objective-C exception:
exceptionClass <class NGSocketShutdownDuringWriteException>
Reason: the socket was shutdown
UserInfo: {
    errno = 107;
    error = "Transport endpoint is not connected";
    stream = <Value with object <NGActiveSocket[0x0810759C]: mode=rw 
address=<In
etSocketAddress: localhost:32794>>>;
}

Could someone please help me?
Thank you in advance.

Fausto
NetiX srl
--
OpenGroupware.org XML-RPC
xmlrpc@xxxxxxxxxxxxxxxxx
http://mail.opengroupware.org/mailman/listinfo/xmlrpc